| // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion |
| /// Description Operator Associativity Precedence |
| /// Assignment ??= Right 1 |
| /// @description Test that '??=' assignment operator has lowest precedence. |
| /// Compare with cascade '..' (precedence 2) and conditional 'e1 ? e2 : e3' |
| /// (precedence 3) operators |
| /// @author sgrekhov@unipro.ru |
| /// @issue 40945 |
| |
| import "../../../Utils/expect.dart"; |
| |
| String log = ""; |
| |
| class C { |
| int? get s1 => null; |
| int? get s2 => -1; |
| |
| void set s1(int? val) { |
| log += val.toString(); |
| } |
| void set s2(int? val) { |
| log += val.toString(); |
| } |
| } |
| |
| main() { |
| C c = new C(); |
| c .. s1 ??= 2 .. s1 ??= 1 .. s2 ??= 3; |
| Expect.equals("21", log); |
| |
| log = ""; |
| c.s1 ??= 1 == 2 ? 2 : 3; |
| Expect.equals("3", log); |
| |
| log = ""; |
| c.s2 ??= 1 == 2 ? 2 : 3; |
| Expect.equals("", log); |
| } |